Marc Mutz - mmutz: Может ли Qt-сигналы возвращать... -… Qt Signals - это синтаксический сахаризованный интерфейс для шаблона сигнализации. Слоты являются получателями сигнала. В прямом соединении с сигналом-слотом вы можете думать о нем аналогично (псевдокоду): Foreach slot in connectedSlotsForSignal(signal): value = invoke slot... Qt 4.7: Signals & Slots The signals and slots mechanism is a central feature of Qt and probably the part that differs most from the features provided by other frameworks.Slots can be used for receiving signals, but they are also normal member functions. Just as an object does not know if anything receives its signals, a slot does... Кто послал сигнал в слот? | C++ (Qt) Кто послал сигнал в слот? - русский QT форум.QT 4.6.2, QT Creator. как написано выше - можно смотреть QObject::sender() но! Тролли пишут что данный путь нарушает "сигнал-слотовую-парадигму" . Qt - Connecting overloaded signals/slots | qt Tutorial
From the Qt documentation we know that “Qt’s meta-object system provides the signals and slots mechanism for inter-object communication, run-time type information, and the dynamic property system.” [ 1].
Boost.Signals позволяет различные стратегии используя возвращаемые значения слотов для формирования возвращаемого значения сигнала. Например. добавляя их, формируя из них vector или возвращая последний. Общая мудрость (выраженная в документации Qt... How Qt Signals and Slots Work The Qt signals/slots and property system are based on the ability to introspect the objects at runtime. Introspection means being able to list the methodsThe first element of the array is the return value. In our example it is 0 because the return value is void. The 3rd parameter passed to activate is the... Can Qt signals return a value? - ExceptionsHub
Slot return value - what if it would be not lost? | Qt Forum
You seem to be in a confusion. Even though signals in Qt can indeed return values, this is rarely used, if ever. Namely because it doesn't make a lot of sense. What you probably want to do is not return but emit the image with a signal, this way you can c++ - QT signal and slot function signature - Stack Overflow Your slots can return a value. However, if the slot is connected to a signal and called when the signal is emitted, the return value will be ignored. But the slot is a normal member function and can be called like any other function. In this case, the return value
The return value is used when making syncrhonous calls across threads inside a Qt application (supported via invokeMethod and settingI think that the return value for a slot is only available when the function is called directly (when it is a normal C++ function) or when using invokeMethod.
QDialog — Qt for Python Modal dialogs are often used in situations where a return value is required, e.g. to indicate whether the user pressed OK or Cancel. A dialog can be closed by calling the accept() or the reject() slots, and exec() will return Accepted or Rejected as appropriate. The exec() call returns the result of the dialog. Sending Python values with signals and slots - FrontPage Sending Python values with signals and slots. On the #pyqt channel on Freenode, Khertan asked about sending Python values via Qt's signals and slots mechanism.. The following example uses the PyQt_PyObject value declaration with an old-style signal-slot connection, and again when the signal is emitted, to communicate a Python dictionary. Qt in Education The Qt object model and the signal slot concept
Feb 8, 2008 ... In C++/Qt, slots are methods that must be declared with a special syntax; ... If the values are the same, we do nothing and return; otherwise, we ...
How Qt Signals and Slots Work - Part 3 - Queued and Inter Thread Connections This blog is part of a series of blogs explaining the internals of signals and slots. Part 1 - How Qt Signals and Slots Work QDialog Class Reference - SourceForge.net The QDialog class is the base class of dialog windows. A dialog window is a top-level window mostly used for short-term tasks and brief communications with the user. QDialogs may be modal or modeless. QDialogs can provide a return value, and they can have default buttons. Passing extra arguments to Qt slots - Eli Bendersky's website A few months ago I wrote about passing extra arguments to slots in PyQt.Here, I want to briefly discuss how the same effect can be achieved with Qt itself. C++ is not as dynamic as Python, so Python's approaches of using lambda or functools.partial won't work . c++ - Qt: meaning of slot return value? - Stack Overflow Qt: meaning of slot return value? ... It seems that's not the only way the return value can be ... Browse other questions tagged c++ qt signals-slots or ask your own ...
Qt Signals - это синтаксический сахаризованный интерфейс для шаблона сигнализации. Слоты являются получателями сигнала. В прямом соединении с сигналом-слотом вы можете думать о нем аналогично (псевдокоду): Foreach slot in connectedSlotsForSignal(signal): value = invoke slot...